One of a series of parts, whether equal or unequal to the other parts of the series, of a given entity or a given process, which part presents or is presented at a particular scheduled interval.

plural of instalment

Third-person singular simple present indicative form of install

Capable of being installed.

Third-person singular simple present indicative form of instal

plural of instal

One who installs. / (computing) A program that installs software in a computer and prepares it for use.

plural of installation

plural of installer

to set up a piece of equipment so that it is ready to use